Pantulan Bola

(A)   Koefisien restitusi

\begin{equation*}
\begin{split}
e & = \sqrt{\frac {h_1}{h_o}} \\\\
e & = \sqrt{\frac {\frac 14 h}{h}} \\\\
e & = \sqrt{\frac 14}\\\\
e & = \frac 12
\end{split}
\end{equation*}

(B)   Tinggi pantulan ketiga

\begin{equation*}
\begin{split}
h_n & = e^{2n} \:.\: h_o \\\\
h_3 & = \left( \frac 12 \right)^{2 \:.\: 3} \:.\: h \\\\
h_3 & = \left( \frac 12 \right)^{6} \:.\: h \\\\
h_3 & = \frac {1}{64} h
\end{split}
\end{equation*}